I would say a little over 200 if you take direct routes and no loops
I love to spend the night in Copper Harbor and then hit the trails early in the morning and they are smooth as silk. We did Bergland to Copper Harbor and back in the same day about 20 years ago, back when grooming wasn't as good as it is today, and it was nothing but 2 footers most of the way home. I was never so happy to see Bergland's city lights in my life! Never again!
Was wanting to know how many miles from Mercer to Copper Harbor.
Thanks,